function result = invert(data)
// Inverts the binary input-string so that 0 becomes 1 and 1 becomes 0.
//
//result = invert(data)

//--------------------------------------------------------------------------
//                           SoftGNSS v3.0
// 
// Written by Darius Plausinaitis, Kristin Larson and Dennis M. Akos
//--------------------------------------------------------------------------
//This program is free software; you can redistribute it and/or
//modify it under the terms of the GNU General Public License
//as published by the Free Software Foundation; either version 2
//of the License, or (at your option) any later version.
//
//This program is distributed in the hope that it will be useful,
//but WITHOUT ANY WARRANTY; without even the implied warranty of
//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//GNU General Public License for more details.
//
//You should have received a copy of the GNU General Public License
//along with this program; if not, write to the Free Software
//Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
//USA.
//--------------------------------------------------------------------------

// CVS record:
// Id: invert.m,v 1.1.2.4 2006/08/14 11:38:22 dpl Exp

dataLength = length(data);
temp(1:dataLength) = '1';

invertMask = bin2dec(char(temp));

result = dec2bin(bitxor(bin2dec(data), invertMask), dataLength);

endfunction
